I think it is just another tool you can use for increased weight gain, but do think it needs to fit your program, We all know that nothing can replace good genetics, but I think we all can do things that will enhance those genetics. We have implanted our steers for years, for us we get the best weight gain with calves that are at least 6 weeks old at implanting, and it is very marginable if they are under 4 weeks old when implanted the first time. Where we really see the weight gain is doing the implanting again at 10 to 11 weeks later, and if we background the calves we do again in about 10 weeks. We see an increase in weight by as much 60# - 75# when wintering, has to be done correctly and very cleanly if not don't bother with it. With the price of 3 implants and $98, for 850# calves you do the math. This is just my opinion, is worth just what you are paying for it. 101